Pressure-actuated circuit control



March 13, 1928.

1. E. MccABE PRESSURE ACTUATED CIRCUIT CONTROL Filed Feb. 11, 1922 3mwnto z;

I firm,

Patented Mar. 13, 1928.

UNITED STATES.

IRA E. MOGABE, OF CHICAGO, ILLTNOIS.

PRESSUBE-ACTUATED CIRCUIT CONTROL.

Application filed February 11, 1922. Serial No. 535,755.

This invention comprises a pressure actuated circuit control. It iscontemplated among the objects of the invention, to associate in compactand accessible arrangement, pressure responsive apparatus adapted to beassociated with a source of varying pres sure .the pressure responsiveapparatus may include a high pressure and a low pressure device andconnections adapted to register difi'erential'pressure; to associatewith such devices a liquid contact circuit control, in the presentinstance shown in the form of a tube, within which the terminals of acircuit are sealed and containing on inert gas for the purpose ofquenching any spark and mercury as the medium through which the circuitis opened and closed.

Another object is to arrange these devices within a closure where theywill be closed off from dust, moisture and any foreign substances whichmight interfere with their perfect working; wherein the. component partsmay be readily seen and easily reached for adjustment or repair; andwherein the carrier for the circuit closing device will lend itself to avariety of uses and various combinations of switch or circuit control inassociation with the pressure devices so that a large and vared class ofuses 'is provided. Other objects and advantages will be in partapparent, and in part brought out more fully in the description whichfollows.

An embodiment of the invention is shown in the accompanying drawing, thefollowing views being shown:

ig. 1, is a view in front elevation, partly broken away, and parts beingshown in section of a device embodying my invention;

Fig. 2, is a view in vertical section on line 22, of Fig. 1; I

Figs. 3 and 4 are detail views in section of the circuit control devicein open and closed position.

Inthese views 1 is a casing of the gauge type. closed in iront by aremovable glass -which permits access to an interior for housing theworking parts, and through which they may be seen. Passing through anopening in the casing there is a nipple for connection to a source ofvariable pressure,

and a hollow inwardly extending portion 2, of the'nipple securedsuitably to the casing constitutes a support and connecting medium forbringing pressure to devices now to be described. The means for securingthe nipple to the casing, as here shown comprise outwardly extendingportions secured to the casing asby screws.

Disposed on the support 2 there are hollow tubes 3 and 4 of the Bourdonvariety, closed at their outer ends and in communication, through theirhollowinteriors with the source of ressure. These may bearranged torespon equall to the influence of pressure or one may be connecteddirectly to a high and the other to a low by direct connection for eachtube in a well known manner, instead of the single source of supply hereshown. These constitute pressure responsive devices the movements ofwhich, due to variations of the pressure, are utilized to performfunctions the manner of which and the'structure utilized will now beexplained.

The outer end of one of the tubes carries a support, in the form of aloop or bridge 5 for anadjustin instrumentality comprising oppositelyisposed screws 6 and 7 threaded into openings placed at opposite sidesof the arms of the loop or support. The outer end of the other tubecarries a support 8 for a pin, axle or fulcrum 9. Mounted for swingingmovement upon this pin and intermediate their ends, there are arms 10,in spaced relation and connected at their upper ends by a friction andbearing pin 11. The other end of the arms has an insulated carrier 12adjustably mounted between the arms and constitutes a support for acircuit controlling instrumentality 13.

This as here shown, is in the form of a hollow tube within which arefused terminals 14 and 15 in communication with lead wires 16 and 17.These are connected, as by posts 18 and 19, with leadsextendingfrombinding posts 20 suitably mounted on the casing and insulated therefrom.The tube is hermetically sealed and contains an inert gas to quenchsparking and a drop 21, of suitable liquid such as mercury, is utilizedto lltl lid

till

ruin

make and break the circuit. The two positions are indicated clearly inFigs. 3 and l.

The arms it) constitute a lever of the first class'carrying at theirtree ends a support for a circuit control, which is in the nature of apendulum, and the sweep and tension or resistance to the action of thetubes 3 and dis regulahle through the adjusting screws ti and it. Thefulcrum 9 being a fixed point at the initial adjustment of the device,it the hearing pin 11 is moved to the left of Fig. l, tor instance, thefree end of arms 10, carrying the circuit control will be swung to theright. This is accentuated by the placing ot the fulcrum nearer theupper end oil the arms. In this way the distance through which thecircuit control device will have to travel betore the mercury reachesthe positidn shown in Fig. 4-, can be regulated at will and the sameadjustment is capable with its movement-in the opposite direction. Afterthe adjustment of the screw 6 or I? has been made to limit the sweep ofthe arms, the other screw may be turned against the bearing pin to placea tension on the pin and oder resistance to the spreading or the tubes 3and d. This constitutes an adjustment tor the pressure. Means areprovided for permitting access to the adjusting screws 6 and 7 from theoutside of the casing, and as here shown comprise threaded openings inalignment with the screws and closed by screw plugs 22. These may besealed against tampering.

The device is shown in neutral position in Fig. l. ldpreading of theouter ends of the Bourdon tubes due to pressure will swing the free endsof arms 10 to the right and cause the circuit control to assume theposition shown inlFig. 3. Reduction of the pressure beyond apredetermined point will swing the free ends of the arms 10 to the leftof Fig. l, causing the mercury to make contact between the contactdevices and close the circuit. By utilizing circuit control deviceshaving a larger number of contact devices several circuits can becontrolled at the same time, it being merely necessary to place in thecarrier 12 a circuit control suitable to the particular use required.The adjustment of the sweep and starting point of the tree ends of thearmsand the tension on the bearing merits a'apted to a large variety ofuses.

Hills the invention has been disclosed in the embodiment herein shown,it will be understood that many changes in the construction andarrangement are contemplated as being within the scope of the inventionas set forth in the claims.

What I claim is:

1. A pressure actuated circuit control comprising a pressure responsiveinstrumentality; a carrier for a liquid contact circuit in permit a widerange of adjust arm and neeanaa opening and closing device; a fulcrumassoresponsive instrumentality to oscillate the carrier; said mechanismincluding a yoke member connected at one point to the pressureresponsive instrumentality and at another point to the carrier.

2. A. pressure actuated circuit control comprising a pressure responsiveinstrumentality; a carrier for a liquid contact circuit opening andclosing device; a fulcrum associated and movable with said pressureresponsive instrumentality on which said carrier is mounted foroscillating movement; a liquid contact circuit opening and closingdevice operatively associable with the carrier;-and mechanism connectingthe pressure responsive instrumentality directly to the carrier; saidmechanism including a yoke member, connected at one point to thepressure responsive instrumentality and at another point to the carrier,and mechanism for changing the position of a portion of the carrier withrelation to the pressure responsive instumentality to vary theoscillatory movement of the carrier.

3. A pressure actuated circuit control comprising a pressure responsiveinstrumentality; a carrier for a liquid contact circuit opening andclosing device; a fulcrum on which said carrier is mounted foroscillating movement; a liquid contact circuit opening and closingdevice operatively associable with the carrier; mechanism connecting thepressure responsive instrumentality directly to the carrier; saidmechanism including a yoke member connected at one point to the pressureresponsive instrumentality and at another point to the carrier;mechanism for changing the position of a portion of the carrier withrelation to the pressure responsive instrumentality to vary theoscillatory movement of the carrier; said mechanism including anadjusting instrumentality forming a part of the connection between theyoke and carrier.

4:. A pressure actuated circuit control comprising pressure responsiveinstrumentality; a bearing for a swinging arm operatively associatedwith the pressure responsive instrumentality; means associated l withthe pressure responsive instrumentality for imparting movement to thearm; a liquid contact circuit cont-rollin device connected with the armand actuab e thereb and close a circuit; means for oiibring resistanceto the movement of the arm on the bearing; said means including aclamping instrumentality adapted to be adjustably associated with aportion of the arm.

5. A pressure" actuated circuit control comprising a pressureres onsiveinstrumentalwhich said carried is mounted for oscillating movement; aliquid contact circuit opening and closing device operatively associable'with the carrier; mechanism connecting the pressure responsiveinstrumentality directly to the carrier; and mechanism for varying theresistance of the carrier to movement whereby the amount of pressurerequired to move the carrier may be adjusted.

' 6. A pressure actuated circuit control comprising a pressureresponsive instrumentality; a carrier for a. liquid contact circuit 0ening'and closing device; a fulcrum on W iich said carrier is mountedfor oscillatingmovement; a liquid contact circuit opening and closingdevice operatively associable with the carrier; mechanism connecting thepressure responsive instrumentality directly to the carrier; andmechanism for varying the resistance of the carrier to movement wherebythe amount of pressure required to move the carrier may be adjusted;said mechanism comprising a friction member connected with the carrierand clamping mechanism carried by the yoke and connected with thefriction member. 1

7. A pressure actuated circuit control comprising a pressure responsiveinstrumen- -tality; a carrier for a liquid contact circuit opening andclosing device; a fulcrum on which said carrier is mounted foroscillating movement; a liquid contact circuit opening and closingdevice operatively associable with the carrier; mechanism connecting thepressure responsive instrumentality directly to the carrier; andmechanism for varying the resistance of the carrier to movement wherebythe amount of pressure required to move the carrier may be adjusted;said mechanism comprising a friction member connected with the carrierand clamping mechanism carried by the yoke and connected with thefriction member; said clamping mechanism including a screw threaded intoa portion of the yoke and hearing against the friction member.

8. A pressure actuated circuit control comprising a pressure responsiveinstrumentality; a fulcrum for an arm operatively associated with aportion of the pressure responsive instrumentality; an arm having aswinging movement on the fulcrum; a 1i uid contact circuit controllinginstrumenta ity operatively associated with the arm whereby movement ofthe arm will operate the liquid contact instrumentality to open andclose a circuit; a connection between another portion of the arm and aportion of the pressure responsive instrumentality whereby variations inpressure will impart movement to the arm; and means for varyingresistance tality; a fulcrum for an arm operatively as sociated with aportion of the pressure responsive instrumentality; an arm having aswinging movement on the fulcrum; a li uid contact circuit controllinginstrumenta 'ty operatively asociated with the arm whereby movement ofthe arm will operate the liquid contact instrumentalit to .open andclose a circuit; a connection etween another por tion of the arm and aportion of the pressure responsive instrumentality whereby variations inpressure will impart movement to the arm; means for varying resistanceto the movement of the arm due to variations of pressure; said meansincluding a member connected with the pressure responsiveinstrumentality and arm; and an adjustable friction device operatively'associated the member and arm.

10. A pressure actuated circuit control comprising a Bourdon tube; ayoke on an end thereof; a second tube; a bearing thereon; an arm mountedfor swinging movement on the bearing; a li uid contact circuitcontrolling instrumenta -'ty operatively associated with the arm; and anadjustable connection between the yoke and a portion of the arm.

11. A pressure actuated circuit control comprising a Bourdon tube; ayoke on an end thereof; a second tube; a bearing thereon; an arm mountedfor swinging movement on the bearing; a liquid contact circuitcontrolling instrumentalit operativcly associated with the arm; can ajustable connection between the yoke and a portion of the arm; and meanscarried by the yoke for imparting a frictional resistance to movement ofthe arm.

12. A pressure actuated circuit control comprising a plurality ofpressure responsive devices; a carrier for a li uid contact circuitcontrol pivotally mounte for swinging movement on one of the pressureresponsive devices to constitutea fulcrum; a hquid contact circuitopening and closing device operatively associable with the carrier;

sive devices to constitute a fulcrum; a liquid eoniznei; eiireniiopeningnnfl eiosing dieniee opennhineiy nseociehie with izhe ennnien;nneehnnisin eenneeizing the enriien nnci on other of ihe pneesnreresponsive devices 'n'henehy movement of either of hhe pnessnife i'esonei-ve devices wiii oscillate the merrier; one. in-eehnnisin foradjusting the position oi izhe eni-irien with neintion to one of ihepnenenne responsive eie'vieee to negnin ie ithe oseiiinhoiy movement ofthe new; enidi w mechanism comprising n menlhei eonneeizin one of thepressure KBSPOHSiVG devices on the carrier; one a screw (iispesedi on'hh'e memhei' and conneehing with the carriers:

In testimony whereof I niiin my signahire.

IRA E. MQUABE.

